When did Marvel begin to call their first 6 films phases? I remember that when i made the MCU: Phase II thread it wasn't called that yet, i called it that because at the time i was interested in the cancelled Star Trek: Phase II tv show and thought the name would fit. Only months after did i see them calling the next series of movies Phase II.

Coincidence or are Marvel execs keeping an eye on these forums?

I think Feige first said "phase one" at NYCC 2011, 5 months after you coined it. Nice job influencing the vocabulary surrounding a major pop culture icon!